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How React Works Under the Hood | React Reconciliation, Fiber, Diffing & Keys Explained Ever wondered how React updates your UI so fast? What's happening behind the scenes when you click a button or change state? In this video, I break down React's internal architecture from first principles - no hand-waving, no buzzwords, just pure engineering concepts. *What You'll Learn:* 🔹 *Virtual DOM & React Elements* - What they actually are (not what tutorials claim) 🔹 *Reconciliation Algorithm* - How React finds differences between old and new UI in O(n) time instead of O(n³) 🔹 *React Fiber Architecture* - The secret data structure that replaced recursion with a linked list 🔹 *Diffing Algorithm* - The two brutal trade-offs React makes to stay blazingly fast 🔹 *Keys in Lists* - Why they're not just about warnings, but about performance and correctness 🔹 *Double Buffering* - How React maintains two trees and swaps them instantly 🔹 *Interruptible Rendering* - How Fiber enables React to pause, prioritize, and resume work *Why This Matters:* Understanding these concepts will make you write better React code. You'll know: When to use React.memo and when it's useless Why keys matter beyond silencing warnings How to structure components for optimal performance What actually causes re-renders (and what doesn't) This isn't just theory - this knowledge has helped me optimize production apps used by millions of users. *Perfect for:* React developers who want to level up Anyone preparing for senior React interviews Developers tired of cargo-cult programming Engineers who learn by understanding "why" not just "how" If you believe in first-principles learning like I do, this video is for you. 🔔 Subscribe for more deep-dives into React, JavaScript, and Web Performance 💬 Drop your questions in the comments - I read and respond to all of them *Follow Coder Army:* 🐦 Twitter: [Your Twitter] 📷 Instagram: [Your Instagram] 💼 LinkedIn: [Your LinkedIn] #React #ReactJS #WebDevelopment #JavaScript #ReactFiber #Programming #CodingTutorial #WebDev #ReactReconciliation #CoderArmy --- Visit Strike: https://strikes.in/ Class start from 1 december Visit Coder Army Website: https://coderarmy.in/#home Course start date: 1 september Timing: 6pm (Mon-fri) Hackathon will be organised after course completion Join Premium Whatsapp Group: https://whatsapp.com/channel/0029Va6H... Class Notes :https://www.notion.so/Lecture06-React... Code Link: https://github.com/coderarmy-notes/me... Twitter: https://x.com/rohit_negi9?s=21 Channel: @CoderArmy9 Buy Our Premium Course of Web dev+Blockchain+HLD+DSA: https://rohittnegi.akamai.net.in/new-... (5500 only) Time Stamp: #javascript #webdevelopment #mernstack